Southwest Airlines has added three nonstop several new routes to Denver. The carrier on Sunday added service to the city from Jacksonville, Newark Liberty and Pittsburgh.

Southwest is now flying three daily round-trip flights from Newark and one daily round-trip flight from both Jacksonville and Pittsburgh.

Denver has become one of Southwest's fastest growing bases since it resumed service there in 2006. The airport is now the fifth busiest in Southwest's route network (as determined by the number of daily departures).

As you would expect, the Denver service was welcomed in the new cities.

"This new service greatly enhances air travel out west and we anticipate the flight will be greeted favorably by both leisure travelers heading to ski resorts and business travelers," Steve Grossman, Jacksonville Aviation Authority CEO, says in a release. "In addition, this service provides excellent connections to central California and the Pacific Northwest."